Question: Which aircraft has the largest wingspan that can be used in a gliding competition?
Paraphrase: Which aircraft can be used in a gliding competition with the largest wing span?
SPARQL (Wikidata): select ?ent where { ?ent wdt:P31 wd:Q15056993 . ?ent wdt:P2112 ?obj . ?ent wdt:P366 wd:Q5569597 } ORDER BY DESC(?obj)LIMIT 5 
Answer: Nimbus-4, Schempp-Hirth Arcus, Lange Antares, Rolladen-Schneider LS6, Rolladen-Schneider LS8